The Wal-Mart trucker accused of causing a deadly crash on the New Jersey Turnpike was free on bail Sunday while former 30 Rock star Tracy Morgan clung to life with injuries sustained in the tragedy.

Two other men also remained in critical condition a day after the wreck near Cranbury Township that killed Morgan's friend and comedic mentor, James "Jimmy Mack" McNair. Morgan, 45, was airlifted immediately after the crash to Robert Wood Johnson Medical Center in nearby New Brunswick, N.J.

State Police said truck driver Kevin Roper failed to see slow-moving traffic. The truck slammed into a 2012 Mercedes Sprinter, a limousine bus carrying Morgan and several others, setting off a chain-reaction crash involving another tractor-trailer, an SUV and two cars, authorities said. All the victims were in the limousine.

NEW YORK - JULY 27: Actor and comedian Tracy Morgan attends "The Darker Side of Green" debate at The Bowery Hotel on July 27, 2010 in New York City. (Photo by Michael Loccisano/Getty Images) (Photo: Michael Loccisano Getty Images)

NEW YORK, NY - MARCH 26: Tracy Morgan speaks onstage at the First Annual Comedy Awards at Hammerstein Ballroom on March 26, 2011 in New York City. (Photo by Dimitrios Kambouris/Getty Images) (Photo: Dimitrios Kambouris Getty Images)

NEW YORK, NY - APRIL 04: Actor/comedian Tracy Morgan was on hand at STK for Jaguar's celebration of its sporting past and future, following the announcment today of the F-TYPE at the New York Auto Show on April 4th, 2012. (Photo by Craig Barritt/Getty Images for Jaguar) (Photo: Craig Barritt Getty Images for Jaguar)

NEW YORK, NY - AUGUST 16: Tracy Morgan and Jane Krakowski were on hand at Jaguar's "Chill NY" on August 16, 2012 to celebrate Jaguar's instinctive All Wheel Drive announcement at High Line Park in New York City. (Photo by Craig Barritt/Getty Images for Jaguar) (Photo: Craig Barritt Getty Images for Jaguar)

NEW YORK, NY - FEBRUARY 01: Tracy Morgan (L) and Artie Lange participate in the DirecTV Beach Bowl at Pier 40 on February 1, 2014 in New York City. (Photo by Michael Loccisano/Getty Images for DirecTV) (Photo: Michael Loccisano Getty Images for DirecTV)

NEW YORK, NY - FEBRUARY 17: Tracy Morgan visits "The Tonight Show Starring Jimmy Fallon" at Rockefeller Center on February 17, 2014 in New York City. (Photo by Theo Wargo/Getty Images for The Tonight Show Starring Jimmy Fallon) (Photo: Theo Wargo)

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Roper, 35, was released on $50,000 bail Saturday night, Wal-Mart spokesman David Tovar said Sunday. Roper, of Jonesboro, Ga., faces charges including death by auto and four counts of assault by auto, Middlesex County, N.J., prosecutors said.

Morgan, who previously starred in Saturday Night Live, had been returning from a stand-up comedy show in Delaware. Jeffrey Millea, 36, of Shelton, Conn., and comedian Ardie Fuqua Jr., 43, were listed in critical condition along with Morgan, hospital spokeswoman Zenaida Mendez said Sunday. Comic Harris Stanton was treated and released from the hospital Saturday.

Wal-Mart President Bill Simon issued a statement saying the company was "profoundly sorry that one of our trucks was involved." He said Wal-Mart would take full responsibility if it was determined that its truck caused the crash.

The National Transportation Safety Board said it was investigating. Morgan's limo was owned by Atlantic Transportation Services, which issued a statement Saturday extending its "sincerest condolences" to the victims and their families. The firm said it had one employee behind the wheel and a second in the front passenger sea.

"Although the investigation is still pending, we concur with the preliminary reports that the accident was caused by another vehicle traveling behind the Atlantic limo bus," the Rehoboth Beach, Del.-based company said.

Morgan, a New York City native, worked on SNL from 1996 to 2003. He joined the cast of NBC's comedy 30 Rock in 2006, receiving an Emmy nomination for best supporting actor in 2009. McNair, 62, was from Peekskill, N.Y.